We are doing story problems. I need help on understanding them so that I
can solve them by myself. I am stuck on one particular problem: The
number is decreased by 1/3 of the number. The result is 62. Find the
number.

A group of chemists are conducting an experiment to produce a new
liquid material. One chemical contains 15% sodium (Na) and the other
chemical contains 30% sodium (Na). Once they mix the two samples the
resulting chemical contains 22% sodium (Na). How many milliliters
(ml) of each sample must be mixed to obtain 600 ml of the new
chemical?